central meaning, definition, what is central: in, at, from, or near the centre or most important part of something: . Learn more.
For other meanings of the term, see backfire (disambiguation). A back-fire or backfire is combustion or an explosion produced by a running internal combustion engine that occurs in the air intake or exhaust system rather than inside the combustion chamber.
Silicone anti-drain back valves. 1  Help prevent oil from draining out of the filter and engine when the engine is not running. 2  Resist the aging effects that an engineâs high heat can cause. 3  Silicone, available in many MotorcraftÂ® oil filter anti-drain back valves, is superior to nitrile rubber, which can become brittle over time.